unable to numerically solve an equation (basic question)

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Hello,
I make my first steps with sage and already run into a problem I was not able to solve. When I enter the following:

reset()
var('x')
eqn=x^2+3*x-9==0
sol=solve(eqn,x,solution_dict=true)
sol[x].n(30)

I get the following error message:

The error message is: ('EOF in multi-line statement', (12, 0))

TypeError                                 Traceback (most recent call last)

/home/.../sage-4.6.2/local/lib/python2.6/site-packages/sage/all_cmdline.pyc in <module>()

/home/.../sage-4.6.2/local/lib/python2.6/site-packages/sage/misc/preparser.pyc in load(filename, globals, attach) <br>
   1594         execfile(fpath, globals)<br>
   1595     elif fpath.endswith('.sage'):<br>
-> 1596         exec(preparse_file(open(fpath).read()) + "\n", globals)<br>
   1597     elif fpath.endswith('.spyx') or fpath.endswith('.pyx'):<br>
   1598         import interpreter<br>

/home/.../sage-4.6.2/local/lib/python2.6/site-packages/sage/all_cmdline.pyc in <module>()

/home/.../sage-4.6.2/local/lib/python2.6/site-packages/sage/symbolic/expression.so in sage.symbolic.expression.Expression.__index__ (sage/symbolic/expression.cpp:16771)()

/home/.../sage-4.6.2/local/lib/python2.6/site-packages/sage/symbolic/expression.so in sage.symbolic.expression.Expression._integer_ (sage/symbolic/expression.cpp:4254)()

TypeError: unable to convert x (=x) to an integer

I added the "..." manually for this post.

Obviously I make a severe problem in getting the numerical solution of this simple equation. Maybe you can help me in getting a numerical solution for an equation.

Btw. I get the same error message when I try the example given in the sage tutorial on page 14 ([[s[p].n(30),.....)

Thanks in advance!